Restriction Of Lpu Types On Link Aggregation - H3C S7500 Series Operation Manual

Operation Manual – Link Aggregation
H3C S7500 Series Ethernet Switches
II. Port status of dynamic aggregation group
A port in a dynamic aggregation group can be in one of the two states: selected or
standby. In a dynamic aggregation group, both the selected and the standby ports can
transceive LACP protocol packets; however, the standby ports cannot forward user
packets.
There is a limit on the number of selected ports in an aggregation group. Therefore, if
the number of the member ports in an aggregation group exceeds the maximum
number supported by the device, the system will negotiate with its peer end, to
determine the states of the member ports according to the IDs of ports of the preferred
device (that is, the device with smaller system ID). The following is the negotiation
procedure:
1) Compare device IDs (system priority + system MAC address) between the two
parties. First compare the system priority of the two devices. If the system
priorities are equal, compare the MAC address of the two systems. The device
with smaller device ID will be considered as the preferred one.
2) Compare port IDs (port priority + port number) on the preferred device. The
comparison between two port IDs is as follows: First compare the two port
priorities, then the two port numbers if the two port priorities are equal; the port
with smaller port ID is a selected port and the other port is a standby port.
In an aggregation group, the selected port with the minimum port number serves as the
master port of the group, and other selected ports serve as member ports of the group.
Note:
The down ports in a static aggregation group or dynamic aggregation group are
standby ports, which is different in manual aggregation groups.
For the restriction of LPU types on link aggregation, refer to
1-3.

1.1.7 Restriction of LPU types on Link Aggregation

Table 1-1
Note:
Type-A LPUs include the following specifications: LS81FT48A, LS81FM24A,
LS81FS24A, LS81GB8UA and LS81GT8UA.
lists link aggregation types and related descriptions.
Chapter 1 Link Aggregation Configuration
1-5
Table 1-2 and Table